Color interpolation system and method thereof

Abstract

A color interpolation system is disclosed. An enhancement unit receives raw signals from an image sensor, and then processes the raw signals to output an enhanced first signal. A first interpolation unit receives and processes a raw first signal and accordingly outputs an interpolated first signal. A gain generator generates an enhancement gain according to the enhanced first signal and the interpolated first signal.

What is claimed is: 
     
       1. A color interpolation system, comprising:
 an enhancement unit coupled to receive a plurality of raw signals from an image sensor, wherein the plurality of raw signals include at least a raw first signal and a raw second signal, and the enhancement unit processes the raw signals to output an enhanced first signal; 
 a first interpolation unit coupled to receive and process the raw first signal and accordingly output an interpolated first signal; 
 a gain generator configured to generate an enhancement gain according to the enhanced first signal and the interpolated first signal; and 
 a gain multiplier configured to multiply the interpolated first signal and the raw second signal respectively with the enhancement gain. 
 
     
     
       2. The system of  claim 1 , further comprising a second interpolation unit coupled to receive and process the raw second signal and accordingly output an interpolated second signal. 
     
     
       3. The system of  claim 2 , wherein the gain multiplier is configured to multiply the interpolated first signal and the interpolated second signal respectively with the enhancement gain. 
     
     
       4. The system of  claim 1 , wherein the enhancement unit comprises an enhancing mask that acts as a high-boost filter. 
     
     
       5. The system of  claim 1 , wherein the enhancement unit and the first interpolation unit perform on a process window consisted of a plurality of image pixels of the image sensor. 
     
     
       6. The system of  claim 5 , wherein the process window of image pixels is configured as a Bayer pattern. 
     
     
       7. The system of  claim 1 , further comprising a blender disposed between the enhancement unit and the gain generator, the blender being configured to give weighting to the enhanced first signal with respect to the interpolated first signal. 
     
     
       8. A color interpolation method, comprising:
 receiving a plurality of raw signals from an image sensor, wherein the plurality of raw signals include at least a raw first signal and a raw second signal, which are processed to output an enhanced first signal; 
 processing the raw first signal to output an interpolated first signal; 
 generating an enhancement gain according to the enhanced first signal and the interpolated first signal; and 
 multiplying the interpolated first signal and the raw second signal respectively with the enhancement gain. 
 
     
     
       9. The method of  claim 8 , further comprising a step of processing the raw second signal to output an interpolated second signal. 
     
     
       10. The method of  claim 9 , further comprising a step of multiplying the interpolated first signal and the interpolated second signal respectively with the enhancement gain.